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Summary of Minimum and Contingent Operating Lease Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Minimum rental income $ 1,973 $ 3,798
Contingent rental income 384 585
Total rental income $ 2,357 $ 4,383